Thermostatic control for warm air furnaces



Feb. 23, 1937. G MUNS 2,071,560

THERMOSTATIC CONTROL FOR WARM AIR FURNACES Filed Oct. 11, 1935 4 A g g 1 I l 3 33 '23, 7 i I 30 s: l I

l i l I 8 g I Gear eE.M S I iNVENTZR Hg 3 W Patented Feb. 23, 1937 UNITED STATES PATENT 5';

THERMOSTATIC CONTROL FOR WARM AIR FURNACES 2 Claims.

This invention relates to thermostatic controls for warm air furnaces.

The principal object is to provide a thermostatic control that is simple of construction and 5 installation, highly efiicient in operation and relatively inexpensive to manufacture.

A further object of the invention is to provide a thermostatic control which may be carried by a bracket attached to the casing of a furnace.

A further object is to provide means for adjusting the thermostatic control to meet varying temperature requirements, thereby providing means for the control of a short or long temperature range.

A still further object is to provide a body member having an expansion rod threaded thereto, together with a lever supported upon an extended portion of said body portion.

With the foregoing and other objects in view 20 which will appear as the description proceeds,

the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise em- 25 bodiment of the invention herein disclosed, can be made within the scope of what is claimed, without departing from the spirit of the invention.

The invention is illustrated in the accompanying drawing, wherein:-

Figure 1 is a side elevation of the device attached to a furnace showing parts of the furnace and the thermostatic control broken away.

Figure 2 is a perspective view of the device.

Figure 3 is a perspective View of a bracket member for supporting the thermostatic control.

Figure 4 is a perspective view of a casing for the thermostatic control.

By referring to Figure 1 it will be seen that there is provided a furnace casing I in which is shown an upper radiator portion 2. A channel bracket member 3 is attached in a vertical manner to a side wall of the casing I.

By referring to Figure 2 it will be seen that there 40 is provided a body member l provided with a laterally extended portion 5. This body member l is attached to the bracket 3 by the insertion of bolts 6 through openings 1 in the body member and openings 8 formed in the channel bracket member.

By referring to Figures 1 and 3 it will be seen that the channel bracket member 3 is provided with an opening 9 in order to allow for an expansion rod IE to be projected through the 55 bracket 3 and secured to the body member by engaging in a threaded opening it in the body member 4. This expansion rod iii is formed in two parts. An inner rod portion iii has its outer end I3 secured to a threaded opening bl in a tubular outer portion iii of the expansion rod iii. It will be seen that an opposite end of the inner rod portion 52. is provided with a fulcrum formed member ll". This expansion rod H3 is formed of different metal varying in the contraction and expansion temperature in order that the fulcrum formed member may be moved outwardly or inwardly following the varying range of temperature.

By referring to Figure 1 it will be seen that the channel bracket member 3 is secured to the furnace casing l at a point that will allow for the passing of the expansion rod it relatively close to an upper surface i8 of the furnace radiator 2.

By referring to Figure 2 it will be seen that the upper surface of the laterally extended portion 5 is provided with a flattened recessed portion 22. It will also be seen that the laterally extended portion 5 is provided with a central opening I!) in order to permit the projection of a lever arm 20. The upper end of the lever arm 20 carries a pin 2| which slides upon the flattened recessed portion 22 when temperature range adjustments are made by means of a threaded adjustment rod 23; carrying a manipulating member 24. This threaded adjusting rod 23 functions in a threaded opening 25 of the laterally extended portion 5 so that an end 26 of the threaded adjusting rod 23 comes in contact with the lever arm 28 a relatively short distance below the flattened recessed portion 22.

It will also be seen by referring to Figure 2 that the body member 4 is provided with a lower extended portion 21 which forms a support carrying a shaft 28. There is attached to one end of this shaft 23 an arm 29 which is provided with a slidable pin 3% functioning in a slotted opening 3! formed in the lower end of the lever arm 26. This arm 29 is securely fastened to the shaft 28 by means of a set screw 32. It will also be seen that the shaft 2%! carries a damper and draft regulator arm 33 which is keyed to the shaft 28 by means of a set screw 3 The damper and draft regulator arm is provided with an opening 35 at its extreme end for the purpose of attaching suitable chains for the manipulation of dampers and draft doors.

It is obvious that when the expansion rod It! is subjected to a changing temperature the arm 33 will be moved either up or down according to the expansion or contraction of the expansion rod l0.

By referring to Figure 4 it will be seen that there is provided a removable casing 36 for the body member 4 and assembled parts. This removable casing 36 is provided with an opening 31 for the projection of the arm 33 and a circular opening 38 through which passes the threaded adjustment rod 23.

What I claim is:

1. A thermostatic control for warm air furnaces comprising a bracket member secured to the outer casing of a furnace and having a body member mounted thereon, said body member having alaterally extended portion provided at its top with a fiat recessed portion having an opening formed therein, a lever arm functioning within said opening and having a slotted lower end, and a pin carried in its upper end slidably maintaining the lever arm on said fiat recessed portion, a threaded adjustment rod passing through a threaded opening in the extended portion of said body member and coming in contact with said lever arm, a manipulating member on said adjustment rod, said body member carrying an expansion rod comprising an inner rod and a tubular outer portion, one end of the inner rod secured to the tubular outer portion, a fulcrum end on said inner rod for the purpose of engaging said lever arm, the inner rod and tubular outer portion made of different metals varying in contraction and expansion temperature, a lower extended portion on said body member having a shaft carried thereon, a damper and draft regulating arm secured to said shaft, a crank on said shaft engaged in said slot, whereby motion of said lever actuates said arm.

2. A thermostatic control for warm air furnaces comprising a bracket member secured to the outer casing of a furnace and having a body member mounted thereon, said body member having a laterally extended portion provided at its top with a flat recessed portion having an opening formed therein, a lever arm functioning within said opening and having a slotted lower end, and a pin carried in its upper end slidably maintaining the lever arm on said flat recessed portion, a threaded adjustment rod passing through a threaded opening in the extended portion of said body member and coming in contact with said lever arm at a point opposite said pin, a manipulating member on said adjustment rod, said body member carrying an ordinary concentric expansion unit having its fulcrum end engaging said lever arm, a lower extended portion on said body member having a shaft carried thereon, a damper and draft regulating arm secured to said shaft, a crank on said shaft engaged in said slot, whereby motion of said lever actuates said arm.

GEORGE E. MUNS. 

